Non-redistributable means that the
license covers installation only on your own machines (or machines
that you exclusively lease) up to the number specified by the license
type. With this license, you may not include the Whois interface as
part of a product sent to other parties.

Internal use means that the Whois
interface should only be used by your own personnel for internal
applications. With this license, you may not offer parsed
Whois data as a service to other other parties.

Exemptions:

You may publicly display raw, unparsed Whois records

You may provide public services that make use of the Whois
interface behind the scenes

You may display up to 5 fields from the parsed Whois data on a
public web page

Two cautions

Domain name registrars and other organizations that maintain Whois
servers are very sensitive about the use of the data and their
servers. This has important implications:

You should always follow terms and policies listed in the Whois
output. Generally, this means that you cannot use Whois data for
building a marketing database.

Make arrangements with server owners if you are going to do a
lot of queries. If you perform many queries without authorization,
they will likely cut you off. For example, as of about a year ago,
Network Solutions instituted a flat 1000 query/day/IP address
limit. GoDaddy begins eliminating the contact information and
dates from Whois output after repeated queries.